Abstract:
:In order to specify the timing of some changes in ovarian steroid production during the transition from vitellogenesis to ovulation, plasma hormones levels andin vivo andin vitro responses of the ovary to salmon gonadotropin (s-GtH) or dibutyryl-cyclic adenosine mono-phosphate (db-cAMP) were recorded in relationship with the state of germinal vesicle migration in the oocyte.In vivo, a small, but significant, increase of plasma 17α-hydroxy-20β-dihydroprogesterone (17α, 20β-OH-P) level was detected earlier (at the "subperipheral germinal vesicle" stage) than the increase of GtH level (detectable at the "peripheral germinal vesicle" stage) and the decline of oestradiol-17β (E2-17β) (also detectable at the "peripheral germinal vesicle" stage). Negative correlations were established between E2-17β levels and GtH (ρ=-0.53) or 17α,20β-OH-P (ρ=-0,43) levels while a positive correlation occurred between 17α,20β-OH-P and GtH levels (ρ=+0,54).In vivo no action of GtH on the decline of E2-17β levels was detected GtH did not stimulate 17α,20β-OH-P production, within 72h, in females at the "end of vitellogenesis" stage. It had significant effect in females at other stages closer to ovulation, but the pattern of responses changed according to the stage.In vitro db-cAMP like GtH was able to stimulate 17α,20β-OH-P output from ovarian follicles. The greatest response was observed at the later stage. (GVBD). Testosterone output was also increased by GtH, but the lowest response was observed at the later stage (GVBD). Androstenedione output was lower than testosterone output.In vitro, a small but significant decline of E2-17β output was induced by GtH. We conclude that substantial changes occur during the very last stages prior to ovulation, both in the steroidogenic potential of the ovary and in the ovarian sensitivity to GtH. 20β-oxydoreductase is probably progressively induced during GV migration when GtH basal levels are increasing but still relatively low. Without minimizing the role of discrete pulses of GtH on this induction, we could expect synergic actions of other hormones. Thus a high testosterone/oestradiol ratio in the follicle environment favours 17α,20β-OH-P secretion.
journal_name
Fish Physiol Biochemjournal_title
Fish physiology and biochemistryauthors
Fostier A,Jalabert Bdoi
10.1007/BF02264076subject
Has Abstractpub_date
1986-10-01 00:00:00pages
87-99issue
1-4eissn
0920-1742issn
1573-5168journal_volume
2pub_type
杂志文章abstract::In order to assess the digestive physiological capacity of the American shad Alosa sapidissima and to establish feeding protocols that match larval nutritional requirements, we investigated the ontogenesis of digestive enzymes (trypsin, amylase, lipase, pepsin, alkaline phosphatase, and leucine aminopeptidase) in larv...
journal_title:Fish physiology and biochemistry
pub_type: 杂志文章
doi:10.1007/s10695-016-0295-2
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abstract::The purpose of the current study was to examine seasonal changes in seawater tolerance and growth performance of anadromous Arctic charr (Salvelinus alpinus L.) held at the same temperature (8°C) during winter and summer. Charr (20-27 cm), previously reared in freshwater under natural photoperiod, were transferred eit...
journal_title:Fish physiology and biochemistry
pub_type: 杂志文章
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abstract::In mammals, androgens appear to enhance the development of primary ovarian follicles, but PI3K (phosphoinositide 3-kinases) pathway is well recognized as one of the critical pathways in early follicular development. Roles of the PI3K were revealed by deletion of PTEN (phosphatase and tensin homolog on chromosome 10). ...
journal_title:Fish physiology and biochemistry
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abstract::Dietary fatty acids, particularly arachidonic acid (ARA), affect cortisol and may influence the expression of genes involved in stress response in fish. The involvement of ARA on stress, lipid, and eicosanoid metabolism genes, in Senegalese sole, was tested. Post-larvae were fed Artemia presenting graded ARA levels (0...
journal_title:Fish physiology and biochemistry
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doi:10.1007/s10695-013-9778-6
更新日期:2013-10-01 00:00:00
abstract::An embryonic stem (ES)-like cell culture system RESC from a commercially important freshwater carp, Labeo rohita, was developed using blastula stage embryos. The cells were cultured in Leibovitz-15 (L-15) medium in gelatin-coated cell culture flask supplemented with 15 % fetal bovine serum along with 10 ng ml(-1) basi...
journal_title:Fish physiology and biochemistry
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abstract::Histone deacetylase 4 (HDAC4) is an important modifier enzyme for chromatin remodeling and plays an essential role in regulating gene expression. Spatio-temporal expression spectrum revealed that zebrafish hdac4 mRNA, ubiquitously distributed in various tissues, were significantly higher at 36 hpf (hours post-fertiliz...
journal_title:Fish physiology and biochemistry
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abstract::Oxidation of rainbow trout haemoglobin (Hb) by nitrite proceeded via an initial lag phase followed by autocatalysis when the O2 saturation of the Hb was high. At low O2 saturations, the rate of methaemoglobin (metHb) formation was strongly reduced and autocatalysis was absent. Addition of adenosine triphosphate and gu...
journal_title:Fish physiology and biochemistry
pub_type: 杂志文章
doi:10.1007/BF00004376
更新日期:1993-08-01 00:00:00
abstract::Mineral needs as affected by changes in dietary protein and oil sources were studied in rainbow trout. Duplicate groups (n = 30 fish per replicate) of rainbow trout (initial BW: 37 g) were fed either a fish meal/fish oil-based (M) or a complete plant ingredient (V)-based diet at four graded ration (R) levels [apparent...
journal_title:Fish physiology and biochemistry
pub_type: 杂志文章
doi:10.1007/s10695-014-0020-y
更新日期:2015-02-01 00:00:00
abstract::Whole animal transepithelial potentials (TEP) of yearling coho salmon (Oncorhynchus kisutch) in fresh water and after transfer to seawater were recorded throughout parr-smolt transformation (smoltification) from February to August 1984, along with plasma Na(+) and Cl(-) concentrations and osmolality. Based on plasma i...
journal_title:Fish physiology and biochemistry
pub_type: 杂志文章
doi:10.1007/BF02183991
更新日期:1987-01-01 00:00:00
abstract::Three consecutive days of injections of triiodothyronine (T3)(0.038, 0.075, 0.15 and 1.54 nmoles/g) significantly elevated the acetylcholinesterase (AchE) activity in the brain of Singi fish, Heteropneustes fossilis (Bloch). The higher doses of 0.075, 0.15 and 1.54 nmoles of T3/g induced a greater increase in enzyme a...
journal_title:Fish physiology and biochemistry
pub_type: 杂志文章
doi:10.1007/BF00004508
更新日期:1993-03-01 00:00:00
abstract::Levels of two types of gonadotropin-releasing hormone (salmon GnRH and chicken GnRH-II) in the brain and pituitary, and content of gonadotropin (GTHIβ and IIβ) in the pituitary were measured in male masu salmon from hatching to gonadal maturation for three years in order to clarify the involvement of GnRHs in precocio...
journal_title:Fish physiology and biochemistry
pub_type: 杂志文章
doi:10.1007/BF00004570
更新日期:1993-07-01 00:00:00
abstract::The aims of the present study were to characterize sperm quality and to quantify seasonal changes in sexual hormone (testosterone [T], 11-ketotestosterone [11-KT] and 17,20β-dihydroxypregn-4-en-3-one [17,20β-P]) levels in male brill (Scophthalmus rhombus) plasma, as well as to test a more intensive sampling strategy t...
journal_title:Fish physiology and biochemistry
pub_type: 杂志文章
doi:10.1007/s10695-012-9692-3
更新日期:2013-04-01 00:00:00
abstract::The questions addressed in this study were: 1) whether insulin added to the incubation medium can down-regulate (125)I insulin binding to isolated hepatocytes of Atlantic salmon (Salmo salar) and rainbow trout (Oncorhynchus mykiss); 2) whether quantitative assessment of insulin processing can be made on isolated fish ...
journal_title:Fish physiology and biochemistry
pub_type: 杂志文章
doi:10.1007/BF00004590
更新日期:1993-07-01 00:00:00
abstract::Juvenile sea bass, 1.5 years old, of mixed sex, held on long photoperiods were fed early on the photoperiod and late on the photoperiod, using different diets. Fish fed natural diets showed a daily rhythmicity of plasma insulin, liver c-AMP, plasma glucose, liver glycogen and muscle glycogen content, however, fish fed...
journal_title:Fish physiology and biochemistry
pub_type: 杂志文章
doi:10.1007/BF01874796
更新日期:1988-10-01 00:00:00
abstract::Cells from a relatively stenohaline marine species, turbot (Scophthalmus maximus) (TF) and an anadromous species, Atlantic salmon (AS) were cultured in media supplemented with NaCl to produce OPs varying from 300 to 500 mOsm kg(-1) and the direct effects of OP (salinity) on the fatty acid compositions of the main glyc...
journal_title:Fish physiology and biochemistry
pub_type: 杂志文章
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更新日期:1995-04-01 00:00:00
abstract::The analysis of the tench growth hormone gene structure revealed a comparable organization of coding and non-coding regions than other from cyprinid species. Based on the performed mRNA and amino acid sequence alignments, gh tench is related to Asian than to European representatives of Cyprinidae family. Second aim of...
journal_title:Fish physiology and biochemistry
pub_type: 杂志文章
doi:10.1007/s10695-012-9661-x
更新日期:2012-12-01 00:00:00
abstract::The present study aimed to assess the sewage effects of the Brazilian Antarctic Station Comandante Ferraz, Admiralty Bay, King George Island, on the hepatic metabolism (energetic, antioxidant, and arginase levels) and levels of plasma constituents of two Antarctic fish species Notothenia rossii and N. coriiceps. The b...
journal_title:Fish physiology and biochemistry
pub_type: 杂志文章
doi:10.1007/s10695-015-0080-7
更新日期:2015-10-01 00:00:00
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journal_title:Fish physiology and biochemistry
pub_type: 杂志文章
doi:10.1007/BF00004358
更新日期:1994-07-01 00:00:00
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journal_title:Fish physiology and biochemistry
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更新日期:2005-04-01 00:00:00
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journal_title:Fish physiology and biochemistry
pub_type: 杂志文章
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更新日期:2020-08-01 00:00:00
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journal_title:Fish physiology and biochemistry
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更新日期:2018-12-01 00:00:00
abstract::The serum carotenoid level gradually increased during the spawning migration of chum salmon (Oncorhynchus keta). Zeaxanthin, a yellowish carotenoid, was detected in the serum of spent males, while astaxanthin was a main carotenoid in the serum of males and females at other developmental stages. A high bilirubin level ...
journal_title:Fish physiology and biochemistry
pub_type: 杂志文章
doi:10.1007/BF01875644
更新日期:1988-05-01 00:00:00
abstract::Histological development of the digestive tract and specific activities of three digestive enzymes (trypsin, alkaline phosphatase, and pepsin) were studied in rock bream Oplegnathus fasciatus from hatching to 50 days after hatching (DAH). At hatching, the digestive tract appeared as an undifferentiated straight tube a...
journal_title:Fish physiology and biochemistry
pub_type: 杂志文章
doi:10.1007/s10695-011-9507-y
更新日期:2012-04-01 00:00:00
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journal_title:Fish physiology and biochemistry
pub_type: 杂志文章
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更新日期:2018-08-01 00:00:00
abstract::In addition to catalytical assays, immunochemical techniques have recently been employed to measure induction of the cytochrome P-450 (P450) monooxygenase system in fish with polyaromatic hydrocarbons (PAH). In the present study, polyclonal antibodies were raised against rainbow trout P450IA1. Levels of rainbow trout ...
journal_title:Fish physiology and biochemistry
pub_type: 杂志文章
doi:10.1007/BF02265140
更新日期:1991-06-01 00:00:00
abstract::Vitamin E, a potent antioxidant consisting of four isomers each (α, β, γ, δ) of tocopherol (T) and tocotrienol (T3), is found naturally in plant oils at different concentrations. In this study, four semi-purified isonitrogenous and isolipidic (10 %) diets containing canola oil, cold-pressed soybean oil, wheat germ oil...
journal_title:Fish physiology and biochemistry
pub_type: 杂志文章
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更新日期:2013-12-01 00:00:00
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journal_title:Fish physiology and biochemistry
pub_type: 杂志文章
doi:10.1007/BF00004649
更新日期:1992-05-01 00:00:00
abstract::Annual plasma insulin and glucose cycles were studied inDicentrarchus labrax maintained in either seawater (37.8‰) or brackish water (3.5‰). In both media, the highest insulin levels were found during the prespawning period (August-November) coincident to increases in weight and a decrease in plasma glucose. During sp...
journal_title:Fish physiology and biochemistry
pub_type: 杂志文章
doi:10.1007/BF02110880
更新日期:1987-10-01 00:00:00
abstract::Histo- and immunohistochemical techniques have recently been used to study the fibre type and myosin expression in fish muscle during development. In the present work, embryonic, larval and adult myosin isozymes (heavy and light chains) and parvalbumin isotypes were analyzed, from fertization to the adult stage, by po...
journal_title:Fish physiology and biochemistry
pub_type: 杂志文章
doi:10.1007/BF00004524
更新日期:1992-08-01 00:00:00
abstract::The pseudobranch in rainbow trout was investigated in order to clarify its metabolic and physiological function. Contents of lactate, glycogen, and glycerides and activities of carbonic anhydrase (CA), lactate dehydrogenase (LDH), and 3-hydroxy-acyl CoA dehydrogenase (HAD) were measured and compared with those in the ...
journal_title:Fish physiology and biochemistry
pub_type: 杂志文章
doi:10.1007/BF00004070
更新日期:1995-08-01 00:00:00